Respuesta :
After you use the create sequence statement to create a sequence, you can use the NEXTVAL pseudo column to get the next value in the sequence.
What is NEXTVAL pseudo column?
Pseudo-columns allow for selection, but you are not permitted to edit, update, or remove their values. A pseudo-column is comparable to a function that doesn't take any inputs. These pseudo-columns are described in this section: NEXTVAL and CURRVAL.
A pseudo column is a "column" that displays a value upon selection but isn't actually one of the table's true columns. SysDate or RowID are two examples. It frequently functions in conjunction with the DUAL table.
- To get the next value in a sequence, use the Oracle NEXTVAL function. Prior to invoking the CURRVAL function, the Oracle NEXTVAL function must be called otherwise an error will be raised.
- Until the Oracle NEXVAL function has been used at least once, the sequence has no current value.
The next value in the series can be obtained using the NEXTVAL pseudo column once a sequence has been created using the create sequence statement.
To learn more about Oracle sequence, refer to:
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